TY - JOUR
T1 - Evolution of surface grain structure and mechanical properties in orthogonal cutting of titanium alloy
AU - Bai, Jinxuan
AU - Bai, Qingshun
AU - Tong, Zhen
AU - Hu, Chao
AU - He, Xin
PY - 2016/12/28
Y1 - 2016/12/28
N2 - In this study, a mesoscale dislocation simulation method was developed to study the orthogonal cutting of titanium alloy. The evolution of surface grain structure and its effects on the surface mechanical properties were studied by using two-dimensional climb assisted dislocation dynamics technology. The motions of edge dislocations such as dislocation nucleation, junction, interaction with obstacles, and grain boundaries, and annihilation were tracked. The results indicated that the machined surface has a microstructure composed of refined grains. The fine-grains bring appreciable scale effect and a mass of dislocations are piled up in the grain boundaries and persistent slip bands. In particular, dislocation climb can induce a perfect softening effect, but this effect is significantly weakened when grain size is less than 1.65 μm. In addition, a Hall–Petch type relation was predicted according to the arrangement of grain, the range of grain sizes and the distribution of dislocations.
AB - In this study, a mesoscale dislocation simulation method was developed to study the orthogonal cutting of titanium alloy. The evolution of surface grain structure and its effects on the surface mechanical properties were studied by using two-dimensional climb assisted dislocation dynamics technology. The motions of edge dislocations such as dislocation nucleation, junction, interaction with obstacles, and grain boundaries, and annihilation were tracked. The results indicated that the machined surface has a microstructure composed of refined grains. The fine-grains bring appreciable scale effect and a mass of dislocations are piled up in the grain boundaries and persistent slip bands. In particular, dislocation climb can induce a perfect softening effect, but this effect is significantly weakened when grain size is less than 1.65 μm. In addition, a Hall–Petch type relation was predicted according to the arrangement of grain, the range of grain sizes and the distribution of dislocations.
KW - Titanium alloy
KW - Plastic behavior
KW - Multiscale simulation
KW - Grain refinement
KW - Dislocation dynamics
UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-84997498685&origin=resultslist&sort=plf-f&src=s&st1=Evolution+of+surface+grain+structure+and+mechanical+properties+in+orthogonal+cutting+of+titanium+alloy&st2=&sid=fa185f8a8ba09949714890b2dc01e473&sot=b&sdt=b&sl=117&s=TITLE-ABS-KEY%28Evolution+of+surface+grain+structure+and+mechanical+properties+in+orthogonal+cutting+of+titanium+alloy%29&relpos=0&citeCnt=6&searchTerm=
U2 - 10.1557/jmr.2016.444
DO - 10.1557/jmr.2016.444
M3 - Article
VL - 31
SP - 3919
EP - 3929
JO - Journal of Materials Research
JF - Journal of Materials Research
SN - 0884-2914
IS - 24
ER -